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It’s an Ill Wind that Blows: New Study Documents How Airborne Nitrogen Undermines Food Chain in Alpine Lakes

Photo of the Loch Vale Wilderness.

Increasing emissions from motor vehicles, energy production and agriculture are causing more nitrogen to be deposited in remote lakes and watersheds in Colorado and around the world, directly affecting the life they contain. Although increased concentrations of nitrogen in alpine lakes from air pollution have been widely reported, two new studies published in Science and Ecology are the first to more completely document just how this increased nitrogen affects lake biology and food webs. The authors, including FORT research ecologist Jill Baron, found that in the presence of too much nitrogen, the algae at the base of the food web are of much poorer quality for zooplankton, the small swimming animals that eat them. These findings are important for those who manage water-quality issues in remote, low-nutrient lakes because they show that sustained increases in atmospheric nitrogen deposition may eventually influence the entire food web of these lakes, including fish. Studies in Colorado, Norway, and Sweden show that the nutrient status of lakes is disrupted in all three regions due to human-caused atmospheric nitrogen deposition.

  Too Much of a Good Thing: Increasing Nitrogen Deposition in Lakes (podcast)
 

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 Survey of Ungulate Abundance on Santa Rosa Island, Channel Islands National Park, California, March 2009

 Nutrient availability and phytoplankton nutrient limitation across a gradient of atmospheric nitrogen deposition

 Ectoparasites of the occult bat, Myotis occultus (Chiroptera: Vespertilionidae)

 Giant Constrictors: Biological and Management Profiles and an Establishment Risk Assessment for Nine Large Species of Pythons, Anacondas, and the Boa Constrictor

 Spring and winter records of the eastern pipistrelle (Perimyotis subflavus) in southeastern New Mexico

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Science Features
Yellow Anaconda captured in Big Cypress National Preserve in southwestern Florida. Photo by Skip Snow, NPS.

 Giant Constrictor Snakes in Florida: A Sizable Research Challenge

 National Ecological Observatory Network (NEON)

 Following Sirenia’s Song: The Meritorious Journey of Research Zoologist Thomas J. O’Shea

 New Web Application Supports Reclamation Decision Making for the Jonah Natural Gas Field

 White-nose Syndrome Threatens the Survival of Hibernating Bats in North America

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